Add logging

db/users.js

@@ -1,17 +1,20 @@
 'use strict';
 
+const {logger} = global;
 const {users} = require('../config');
 
 module.exports.findById = (id, done) => {
     for (const user of users) {
         if (user.id === id) return done(null, user);
     }
-    return done(new Error('User Not Found'));
+    logger.log('error', new Error('User Not Found'));
+    return done();
 };
 
 module.exports.findByUsername = (username, done) => {
     for (const user of users) {
         if (user.username === username) return done(null, user);
     }
-    return done(new Error('User Not Found'));
+    logger.log('error', new Error('User Not Found'));
+    return done();
 };